Surface Bubble Growth in Plasmonic Nanoparticle Suspension

Zhang, Qiushi; Neal, Robert D.; Huang, Dezhao; Neretina, Svetlana; Lee, Eungkyu; Luo, Tengfei

doi:10.1021/acsami.0c05448

“…The first stage is very fast, on the order of miliseconds. 51,53 The second stage, gas molecules dissolving back to water, is found to dominate the shrinkage process and the time scale is on the order of hundreds of seconds, which is consistent to other studies. 54 For instance, a bubble of 40 μm in diameter lasts about ~300 s before it eventually vanishes ( Fig.…”

Section: Mechanism Of Ssbdsupporting

confidence: 90%

“…1b). 50,51 Particle movement and trapping around a photothermal plasmonic bubble are associated with factors including optical forces, thermophoresis and convective flow. 22, 26, Particularly, the laserilluminated volume above the bubble is hotter than the bottom due to plasmonic heating of the suspended AuNP.…”

Section: Mechanism Of Ssbdmentioning

confidence: 99%

Biocompatible Direct Deposition of Functionalized Nanoparticles using Shrinking Surface Plasmonic Bubble

Moon¹,

Zhang²,

Huang³

et al. 2020

Preprint

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<p>Functionalized nanoparticles (NPs) are the foundation of diverse applications, such as photonics, composites, energy conversion, and especially biosensors. In many biosensing applications, concentrating the higher density of NPs in the smaller spot without deteriorating biofunctions is usually an inevitable step to improve the detection limit, which remains to be a challenge. In this work, we demonstrate biocompatible deposition of functionalized NPs to an optically transparent surface using shrinking surface plasmonic bubbles. Leveraging the shrinking bubble can enable to mitigate any potential biomolecules degradation by strong photothermal effect, which has been a big obstacle of bridging plasmonic bubbles with biomolecules. The deposited NPs are closely packed in a micro-sized spot (as small as 3 μm), and the functional molecules are able to survive the process as verified by their strong fluorescence signals. We elucidate that the contracting contact line of the shrinking bubble forces the NPs captured by the contact line to a highly concentrated island. Such a shrinking surface bubble deposition (SSBD) is low temperature in nature as no heat is added during the process. Using a hairpin DNA-functionalized gold NP suspension as a model system, SSBD is shown to enable much stronger fluorescence signal compared to the optical pressure deposition and the conventional steady thermal bubble contact line deposition. The demonstrated SSBD technique capable of directly depositing functionalized NPs may benefit a wide range of applications, such as the manufacturing of multiplex biosensors.</p>

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“…One mechanism that can potentially contribute to the surface bubble formation in the NP suspension is the volumetric photothermal heating (28), where the CS NPs in suspension absorb laser energy and heat up the laser-irradiated volume. However, if the bubble formation is such a purely thermal process, the nucleation dynamics would be similar for both the BF and FF surfaces when the laser is focused on them, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…For photothermal conversion, metallic nanostructures are among the most efficient transducers, as they can support the surface plasmonic resonance (SPR) to amplify the light intensity at the metal/dielectric interface by orders of magnitude (21,22). In addition, since the resonant wavelength of the SPR can be tuned by properly designing the shape, spacing and size of the metallic nanostructures at a sub-wavelength scale, there have been systematic studies of surface bubble formation with SPR (i.e., plasmonic surface bubble) (11,(23)(24)(25)(26)(27)(28)(29). Fundamental studies have focused on the growth dynamics of the plasmonic surface bubbles, revealing interesting physics about bubble oscillation, vaporization, and gas expelling (30,31).…”

Section: Introductionmentioning

confidence: 99%

Optically Driven Gold Nanoparticles Seed Surface Bubble Nucleation in Plasmonic Suspension

Zhang

¹

,

Li

²

,

Lee

³

et al. 2021

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Photothermal surface bubbles play important roles in a wide range of applications like catalysis, microfluidics and biosensing, but their formation on a transparent substrate immersed in a plasmonic nanoparticle (NP) suspension has an unknown origin. Here, we show that NPs deposited on the substrate by dispersive optical forces are responsible for the nucleation of such photothermal surface bubbles. Highspeed videography shows that the surface bubble formation is always preceded by the optically driven NPs moving toward and adhering to the surface. We observe that the thresholds of laser power density to form a surface bubble drastically differ depending on if the surface is forward-or backward-facing the light propagation direction, which cannot be explained by a purely thermal process (e.g., volumetric heating by plasmonic NPs). This can be attributed to different optical power densities needed to enable optical pulling and pushing of NPs in the suspension. Optical pulling requires higher light intensity to excite supercavitation around NPs to enable proper optical configuration. Eventually, these optically deposited NPs work as a surface photothermal heater, seeding the surface bubble nucleation. We also find that there is a critical number density of deposited NPs to nucleate a surface bubble at a given laser power density, and it is nearly the same for both the forward-and the backward-facing surfaces. Our finding reveals interesting physics leading to photothermal surface bubble generation in plasmonic NP suspensions.

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“…1b). 50,51 Particle movement and trapping around a photothermal plasmonic bubble are associated with factors including optical forces, thermophoresis and convective flow. 22,26,29 Particularly, the laserilluminated volume above the bubble is hotter than the bottom due to plasmonic heating of the suspended AuNP.…”

Section: Mechanism Of Ssbdmentioning

confidence: 99%

Biocompatible Direct Deposition of Functionalized Nanoparticles using Shrinking Surface Plasmonic Bubble

Moon

¹

,

Zhang²,

Huang³

et al. 2020

Preprint

Self Cite

0

View full text Add to dashboard Cite

<p>Functionalized nanoparticles (NPs) are the foundation of diverse applications, such as photonics, composites, energy conversion, and especially biosensors. In many biosensing applications, concentrating the higher density of NPs in the smaller spot without deteriorating biofunctions is usually an inevitable step to improve the detection limit, which remains to be a challenge. In this work, we demonstrate biocompatible deposition of functionalized NPs to an optically transparent surface using shrinking surface plasmonic bubbles. Leveraging the shrinking bubble can enable to mitigate any potential biomolecules degradation by strong photothermal effect, which has been a big obstacle of bridging plasmonic bubbles with biomolecules. The deposited NPs are closely packed in a micro-sized spot (as small as 3 μm), and the functional molecules are able to survive the process as verified by their strong fluorescence signals. We elucidate that the contracting contact line of the shrinking bubble forces the NPs captured by the contact line to a highly concentrated island. Such a shrinking surface bubble deposition (SSBD) is low temperature in nature as no heat is added during the process. Using a hairpin DNA-functionalized gold NP suspension as a model system, SSBD is shown to enable much stronger fluorescence signal compared to the optical pressure deposition and the conventional steady thermal bubble contact line deposition. The demonstrated SSBD technique capable of directly depositing functionalized NPs may benefit a wide range of applications, such as the manufacturing of multiplex biosensors.</p>

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Surface Bubble Growth in Plasmonic Nanoparticle Suspension

Cited by 24 publications

References 72 publications

Biocompatible Direct Deposition of Functionalized Nanoparticles using Shrinking Surface Plasmonic Bubble

Biocompatible Direct Deposition of Functionalized Nanoparticles using Shrinking Surface Plasmonic Bubble

Optically Driven Gold Nanoparticles Seed Surface Bubble Nucleation in Plasmonic Suspension

Biocompatible Direct Deposition of Functionalized Nanoparticles using Shrinking Surface Plasmonic Bubble

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